<template>
  <div class="">
    <div class="crumbs">
      <el-breadcrumb separator="/">
        <el-breadcrumb-item><i class="el-icon-lx-copy"></i> tab选项卡</el-breadcrumb-item>
      </el-breadcrumb>
    </div>
    <div class="container">
      <el-tabs v-model="message">
        <el-tab-pane :label="`未读消息(${unread.length})`"
                     name="first">
          <el-table :data="unread"
                    :show-header="false"
                    style="width: 100%">
            <el-table-column>
              <template slot-scope="scope">
                <span class="message-title">{{scope.row.title}}</span>
              </template>
            </el-table-column>
            <el-table-column prop="date"
                             width="180"></el-table-column>
            <el-table-column width="120">
              <template slot-scope="scope">
                <el-button size="small"
                           @click="handleRead(scope.$index)">标为已读</el-button>
              </template>
            </el-table-column>
          </el-table>
          <div class="handle-row">
            <el-button type="primary">全部标为已读</el-button>
          </div>
        </el-tab-pane>
        <el-tab-pane :label="`已读消息(${read.length})`"
                     name="second">
          <template v-if="message === 'second'">
            <el-table :data="read"
                      :show-header="false"
                      style="width: 100%">
              <el-table-column>
                <template slot-scope="scope">
                  <span class="message-title">{{scope.row.title}}</span>
                </template>
              </el-table-column>
              <el-table-column prop="date"
                               width="150"></el-table-column>
              <el-table-column width="120">
                <template slot-scope="scope">
                  <el-button type="danger"
                             @click="handleDel(scope.$index)">删除</el-button>
                </template>
              </el-table-column>
            </el-table>
            <div class="handle-row">
              <el-button type="danger">删除全部</el-button>
            </div>
          </template>
        </el-tab-pane>
        <el-tab-pane :label="`回收站(${recycle.length})`"
                     name="third">
          <template v-if="message === 'third'">
            <el-table :data="recycle"
                      :show-header="false"
                      style="width: 100%">
              <el-table-column>
                <template slot-scope="scope">
                  <span class="message-title">{{scope.row.title}}</span>
                </template>
              </el-table-column>
              <el-table-column prop="date"
                               width="150"></el-table-column>
              <el-table-column width="120">
                <template slot-scope="scope">
                  <el-button @click="handleRestore(scope.$index)">还原</el-button>
                </template>
              </el-table-column>
            </el-table>
            <div class="handle-row">
              <el-button type="danger">清空回收站</el-button>
            </div>
          </template>
        </el-tab-pane>
      </el-tabs>
    </div>
  </div>
</template>

<script>
export default {
  name: 'tabs',
  data () {
    return {
      message: 'first',
      showHeader: false,
      unread: [{
        date: '2018-04-19 20:00:00',
        title: '【系统通知】该系统将于今晚凌晨2点到5点进行升级维护'
      }, {
        date: '2018-04-19 21:00:00',
        title: '今晚12点整发大红包，先到先得'
      }],
      read: [{
        date: '2018-04-19 20:00:00',
        title: '【系统通知】该系统将于今晚凌晨2点到5点进行升级维护'
      }],
      recycle: [{
        date: '2018-04-19 20:00:00',
        title: '【系统通知】该系统将于今晚凌晨2点到5点进行升级维护'
      }]
    }
  },
  methods: {
    handleRead (index) {
      const item = this.unread.splice(index, 1)
      console.log(item)
      this.read = item.concat(this.read)
    },
    handleDel (index) {
      const item = this.read.splice(index, 1)
      this.recycle = item.concat(this.recycle)
    },
    handleRestore (index) {
      const item = this.recycle.splice(index, 1)
      this.read = item.concat(this.read)
    }
  },
  computed: {
    unreadNum () {
      return this.unread.length
    }
  }
}

</script>

<style>
.message-title {
  cursor: pointer;
}
.handle-row {
  margin-top: 30px;
}
</style>
